Chris
When running Opera here I used the same setup as on cw. A continuous source of
RF attached to the input of the amplifier with the Opera signal keying the
amplifier directly. There was never a problem in many hours of operation. Are
the leading and falling edges of your Opera signal shaped similar to a cw
signal?
Jay W1VD
----- Original Message -----
From: Chris Wilson <[email protected]>
Reply-To: <[email protected]>
To: N1BUG <[email protected]>
Sent: 2/26/2019 6:18:36 AM
Subject: Re: LF: Class D current spikes
________________________________________________________________________________
Hello N1BUG,
Just to add things were MUCH worst using a X2 multiplier circuit
(Jay's). I now use an exciter frequency of X2 direct both from the
U3S, and as of late X2 from the TS-590 into a simple squarer and use
WSPR in the "Advanced" X2 mode to correct the WSPR tones. No issues at
all with either. OPERA is a no no as of this time, it is a FET killer
:) Don't know why though. It would be great to get to the bottom of
all this!
Tuesday, February 26, 2019, 11:05:15 AM, you wrote:
> Jay,
> I was using an HF transceiver in CW mode through a down converter.
> Other FETs were lost at end of envelope while running JT9 with the
> transceiver in USB being fed audio from a sound card. The latest was
> with audio from a different sound card into the new phasing exciter.
> I have never lost a FET while running with the U3S.
> 73,
> Paul
--
Best regards,
Chris mailto:[email protected]
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